国土资源遥感2013，Vol.25Issue(3)：43-50,8.DOI:10.6046/gtzyyg.2013.03.08
西藏高原典型草地地上生物量遥感估算
Aboveground biomass estimate methods for typical grassland types in the Tibetan Plateau
摘要
Abstract
The estimation of aboveground biomass (AGB) is necessary for studying productivity,carbon cycles,nutrient allocation,fuel accumulation in terrestrial ecosystems,and rangeland management and monitoring.In this study,AGB estimate models were developed for 3 major grassland types (alpine meadow,alpine steppe,and temperate steppe) in the Tibetan Plateau by integrating AGB data collected from 6 sites in central Tibet in 2004 and concurrent vegetation index (VI) derived from MODIS data sets.The results show that MODIS VI is more suitable for estimates of alpine meadow and alpine steppe.The cubic polynomial regression based on NDVI is the best estinate model for alpine meadow with the correlation of 0.82,while for alpine steppe the model is EVI based cubic polynomial regression model with the correlation of 0.83 ; due to strong spatial heterogeneity of temperate steppe in central Tibet,the relationship between AGB and VI for temperate steppe is poorer than that for alpine grassland (alpine meadow,alpine steppe).The MODIS VI based estimates of AGB during the growing season is better than the total biomass; during the growing season the correlation between AGB of alpine grassland (alpine meadow and alpine steppe) and MODIS VI is higher than 0.8 with a maximum value of 0.92,and for temperate steppe it is above 0.67 also.In contrast,NDVI is the best vegetation index for AGB estimates of alpine meadow and temperate steppe while EVI is the best for alpine steppe.Due to unique spectral response of green vegetation,MODIS VI is more suitable for estimates of AGB during the growing season,and the accuracy of AGB estimates will decrease during the non-growing season.For the same types of grassland with less difference in AGB,the linear or polynomial regression model is more suitable for modeling or estimating AGB in the Tibetan Plateau than other estimate models.关键词
草地地上生物量/典型草地/估算方法/西藏高原Key words
aboveground biomass/ typical grassland/ estimate model/ Tibetan Plateau分类
信息技术与安全科学引用本文复制引用
除多,德吉央宗,姬秋梅,唐红..西藏高原典型草地地上生物量遥感估算[J].国土资源遥感,2013,25(3):43-50,8.基金项目
西藏自治区重点科技计划项目(编号:201015). （编号:201015）
